OTHER ASSETS, NET - Schedule of Changes in Notes Receivable, Net of Allowance (Details) $ in Thousands	6 Months Ended
Jun. 30, 2026 USD ($)
Notes Receivable [Roll Forward]
Beginning balance, net of allowance for credit losses	$ 39,609
Notes issued, net of allowance for credit losses	0
Repayments	(3,101)
Ending balance, net of allowance for credit losses	$ 36,508

Financing Receivable, Excluding Accrued Interest, Increase From Issuance, Net Of Allowance For Credit Losses

No definition available.

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Namespace Prefix:	miax_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Notes Receivable

+ References

No definition available.

+ Details

Name:	miax_NotesReceivableRollForward
Namespace Prefix:	miax_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable classified as noncurrent. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLossNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash inflow associated with the collection of receivables arising from the financing of goods and services.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration